#include<bits/stdc++.h>
using namespace std;
typedef long long ll;


signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(20);
    
    ll n;
    cin>>n;
    ll a[n];
    ll now = 1;
    for(int i=0;i<n;i++){
        cin>>a[i];
        a[i] %= 9;
        now *= a[i];
        now %= 9;
    }
    cout << now << endl;

}